where did the 500 in front of the +100 come from and where did the 500 behind 2000 come from. can i get calculations and explanation on how they got it

P's employer provided her with the following gifts and awards: Wedding gift (cutlery) - $500; Holiday season gift (art) - $500; Excellence award (gift certificate) - $100; First long service award for 10 years of service (golf clubs) - $2.000. What amount is included in P's employment income for tax purposes? $-o Explanation [($500 + $500) - $500 + $100 + {$2.000 $500) = $2,100]